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Analog front end suits metering apps from gas to glucose

Catering to a range of metering applications, including industrial and medical, Microchip's latest analog front end (AFE) features dual 16 or 24bit delta-sigma analog-to-digital converters (ADCs) boasting up to 91dB signal to noise and distortion (SINAD).

Integrated programmable gain amplifiers (PGAs) and a low-drift voltage reference enable the MCP3901 to measure very small signals. Other functions include phase-delay compensation that allows the MCP3901 to compensate for differences in phase when used in three-phase energy-metering applications; whilst a modulator output block enables precise measurements to be taken, according to Microchip. Sample rates up to 64kilosamples per second (ksps) can be achieved.

An SPI interface provides a simple connection to a microcontroller, but can also be used to adjust the ADC over sampling ratio to control the resolution and sample rate, depending on the application's needs.

The MCP3901 AFE comes in a 20-pin SSOP package. An evaluation board is available, with accompanying software to display analysis parameters such as SINAD, effective number of bits (ENOB), total harmonic distortion (THD), and signal-to-noise ratio (SNR). For further information visit Microchip's website here.

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